Printer&#39;s quoin.



UNITED STATES PATENT OFFICE.

HENRY P. HAMEL, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO PAUL C. RIEBE, OF CHICAGO, ILLINOIS.

PRINTERS QUOIN.

SPECIFICATION forming part of Letters PatentNo. 715,790, dated December 16, 1902.

- Application led September 2, 1902. Serial No. 121,760. (No modem To a/ZZ whom t may concern,.-

Be it known that I, HENRY RHAMEL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,

have invented certain new and useful Improvements in Printers Quoins, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

1o This invention relates to printers quoins, and is particularly designed to be embodied in quoins of a class comprising two members having their inclined faces bearing upon each other and provided with parallel racks facing I5 each other which are engaged by pinion on the end of the key for the Vpurpose of actuating them longitudinally in opposite directions to cause them to wedge. It consists in the specific features set out in the claims for re- 2o taining the two members against slipping.

In the drawings, Figure l is a plan View of my improved quoin. Fig. `24is a side elevation of the customary locking-keyhaving a pinion at the end. Fig. 3 is a magnified detail plan viewing a portion of the quoin. Fig.

4 is a similar View showing a slight modification in the formation of the interlocking parts. Fig. 5 is a side elevation of one of the members of the quoin. Fig. 6 is a section at the 3o line 6 6 on Fig. 3.

The two quoin members l and 2 are formed with the customary rack-teeth 3 3, cut back from the inclined faces 4 4, respectively, for engagement with the pinion 5 of the key 6, as

3 5 in the familiar construction of quoins of this type. The two members are also formed one with tongues 7 7 and the other with a groove 8, interlocking to guide them in their relative longitudinal wedging movement, the lips 8a 8 4o of the groove 8 being reduced to mere fingers by the cutting back of the rack-teeth 3 3. Each member therefore has a shoulder 9, on which the end of the lip-finger 8a bears and slides, While the two inclines bear and slide on each other in the wedging action.

As thus far described the features are those which are common in quoins of this type.

The feature whigh constitutes my invention is the sinuous, serrated, or serpentine for- 5o mation of the inclined faces 4 4, which are in contact and which slide on each other in the wedging action, and in the corresponding formation of the shoulders 9, on which the lipfinger 8a slides. The purpose of the sinuosity or serration of these surfaces is to cause 5 5 the two members to be locked together by the interlocking or engaging of the reciprocal sinuous or serrated surfaces, the end of the lip-linger 8ad being regarded as having the same formation, although it may comprise 6oonly one bend or curve or tooth of a sinuous or serrated edge. It is obvious, however, that this linger need not be limited to a single tooth or bend at the end in order that the parts may operate with the effect indicated-that is, so as to lock the members against slipping back along their inclined faces-and especially so as to resist the tendency to such slipping when the form is in the press and is reciprocated in the printing proc- 7o ess in the direction of the length ofthe quoin with a strong tendency to cause such slipping. It is important that the pitch of the sinuosities or serrations thus interlocked shall be on the upper or higher side or slope steeper with respect to the general trend of the inclined faces of the two members than said inclined faces are with respect to the parallel sides. For illustration, referring to the magnified views, Figs. 3 and 4, it will be seen 8o that as the quoin is tightened the wedging action takes place by the slopes a a, of the opposite members riding upon each other and that when the sinuosities are crest to crest the wedging action is maximum and that the form is a little `relieved-that is, reacts elastistically from the pressure to which it is subjected as the crest of the sinuosities in the respective members pass off from each other and down the opposite slopes b b. Now if 9o these opposite slopes b b are not steep enough to more than equal and neutralize the general slope of the inclined faces there will be no positive locking, and the longitudinal reciprocation of the form in vthe press will tend to jar the quoin members back along the slopes b b, which, in fact, would in that case be slopes only with respect to the general inoline and would not be inclined at all with respect to the parallel edges.

there should be locking, it will be seen that these slopes b b must trend from the crest In order that roo back toward the parallel edge of the quoin member, so that the recess of each sinuosity or seri-ation is nearer the lateral edge than the crest preceding it. This may be the case when the sinuosity is such as shown in Fig. 3, the slope both ways from each crest being equal, considered with respect to the general trend of the inclined edge; but a somewhat better tightening eiect may be produced by making the slope a steeper with respect to the general trend of the inclined edge than the slope b, as seen in Fig. 4, the latter slope being, however, suciently steep to meet the above-stated requirement that the bottom of the recess shall be nearer the lateral edge than the crest which precedes it.

This form of quoin-that is, one involving the sinuous or serrated interlocking edgesmay be operated Without resort to the rack and pinion, the two members being driven with an ordinary shooting-stick. I do not limit myself, therefore, to having the quoin members provided with the racks.

I claim* l. A printers quoin comprising two members, having their inclined faces in contact, reciprocally longitudinally sin nous or serrated and interlocking, the slope of the serrations or sinuosities on the side toward the wider end of each member being inward toward the outer or parallel edge of the member, whereby it is rendered impossible for the members to slip back relatively without compressing the form.

2. A printers quoin comprising two members having their inclined faces in contact and having parallel racks cut back from their inclined faces over an intermediate portion of their length adapted for engagement with a pinion to actuate them longitudinally in opposite directions, each member having at the narrower end, a shoulder cut back from the inclined face and standing in a plane substantially parallel to that of the latter, each member having at the widerendarigid tooth or finger projecting across theinclined plane of said faces in contact, toward and into endwise contact with such shoulder upon the other member, said shoulders being longitudinally sinuous or serrated on the face which receives such endwise contact, and the point of the fingers being adapted to engage the serrations or sinuosities of the shoulders as the ngers travel along the latter in ,the longitudinal movement of the two members upon each other.

In testimony whereof I have hereunto set my hand, in the presence of two witnesses, at Chicago, Illinois, this 28th day of August,

HENRY P. HAMEL. In presence of- OHAs. S. BURTON, J. S. ABBOTT. 

